The dictionary markup can be used to store key-value pairs like in a dictionary or glossary. It uses definition lists (see HelpOnLists). A dictionary page used by the system has to have a name ending with Dict (see page_dict_regex on the page HelpOnConfiguration).

Dictionaries can be either shared or private (only you have read access to them under your homepage).

Dictionaries for translations

Dictionaries can be used to translate user-specified words with auto-substitution1. If you want to use that a dictionary has to be named in the form LanguageDict (examples: GermanDict, FrenchDict, SpanishDict, etc.).

this is an alternative for the distributed PO-Files, which are used instead in MoinMaster wiki (1)